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This paper studies closed-form expression between detect probability and false alarm probability for centralized cooperative network in cognitive radio based on a fuzzy decision scheme. By introducing two thresholds and fuzzy logic values to represent the reliability of the decision results, a novel fuzzy decision scheme for cooperative spectrum sensing is proposed. Analysis and simulations show that...
We propose a cognitive cooperative scheme based on cognitive relays in the downlink of a time division multiple access (TDMA) system. Cognitive relays utilize the spectrum holes detected via the spectrum detection to relay information, which can share the downlink slots through the frequency-division orthogonal transmission. Therefore, no extra system resources (slots or channels) are allocated for...
Cognitive radio (CR) is a promising concept for improving the utilization of scarce radio spectrum resources. Orthogonal frequency division multiplexing (OFDM) is regarded as a potential transmission technology for CR systems. This paper applies relay technology to such OFDM-based CR system and investigates the power allocation over the frequency subchannels at the source and relay to maximize the...
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